Display the most frequently occurring envelope From:, Subject:,
    or message content fields found in message files in the channel
    queues. By default, only Subject: fields are shown (/SUBJECT).
    Use /ENV_FROM to display frequent envelope From: fields or
    /CONTENT to display frequent message contents. Any combination
    of /CONTENT, /ENV_FROM, and /SUBJECT may be specified. However,
    only one of each may be used.

    The optional channel parameter restricts the scan to message
    files in the specified channel. The channel parameter may use *
    and ? wild cards.

    By default, the top 20 most frequently occurring fields are
    shown (/TOP=20) provided that they occur 2 or more times (/MIN_
    COUNT=2). Use the /TOP and /MIN_COUNT qualifiers to alter this
    behavior. The message files searched may be either all those
    present in the channel queue directory tree, or only those files
    with entries in the queue cache database. Use either the VIEW
    command of the /DIRECTORY_TREE or /DATABASE qualifier to control
    which files are searched.

    The /THREADS qualifier may be used to accelerate scanning on
    multiprocessor systems by dividing the work amongst multiple,
    simultaneously running threads. To run n simultaneous scanning
    threads, specify /THREADS=n. The value N must be in the range
    1-8. The default is /NOTHREADS.

    The /CONTENT, /ENV_FROM, and /SUBJECT qualifiers accept the
    optional qualifiers START=n and LENGTH=n. These qualifiers
    indicate the starting offset and number of bytes in the field
    to consider. The defaults are /CONTENT=(START=1,LENGTH=256),
    /ENV_FROM=(START=1,LENGTH=2147483647), and
    /SUBJECT=(START=1,LENGTH=2147483647). Use of these qualifiers
    is useful when, for example, trying to identify occurrences of a
    spam message which uses random text at the start of the Subject:
    line.